IIRC .WV file should be the very first file inside .ISO container. That's all (never tried to make such files though).

I know about this limitation. I used -sort option of mikisofs. But result is the same: file is playing, but no tracks showed and no pictures showed in foobar. Even if CUESHEET is embedded in WavPack file with -w "CUESHEET=@file.cue".